US 7272916 B2
A system for inspecting seal integrity of a sealed package including a visual inspection system and a medical packaging system having an integral peel testing device.
1. A system for testing seal integrity of a package, the system comprising:
a housing having an opening and a slit extending from the opening into interior space disposed within the housing, said slit receiving a sealed portion of the package;
a magnifying lens supported by said housing above said slit; and
a light source supported by said housing that illuminates the sealed portion of the package received by said slit;
wherein said opening, slit and magnifying lens are positioned such that the sealed portion of the package received by said slit is visible through said magnifying lens.
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This is a divisional of application Ser. No. 10/612,690 filed on Jul. 2, 2003, now U.S. Pat. No. 7,036,287.
The present invention relates to a device and method for inspecting and monitoring the seal integrity of sterile medical packages, and more particularly, to a device having an integral seal peel tester for collecting and correlating test data in order to maintain compliance to FDA's quality system regulations; the invention also relates to an external visual inspection unit for side lighting the seal area of the package for inspecting seal integrity
A basic medical sealer requires four basic components to work properly: a solenoid or pneumatic piston, a jaw mechanism, a heating element, and a microprocessor. Referring to
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Packages sealed by medical sealers must meet government standards; therefore, the seal integrity of packages must be routinely tested during production. There are different tests for inspecting seal integrity, the most common being peel testing and visual testing. Peel testing is the most common way to determine seal strength utilizing destructive methodology. These test modalities are used when developing the Design of Experiments for the validation processes. The visual process is used most often as an in-process system of seal inspection as it is non-destructive. Peel testing measures the strength of seal in pounds while visual testing analyzes seal integrity for pleating, cracking, bubbling, etc. Basic medical sealers used in the art today do not include a mechanism for thorough inspection of seal integrity of the package being sealed. Currently, when a medical packager seals a pouch using a medical sealer, he or she must occasionally pull a pouch out of production to test the seal. Testing the seal usually involves taking it to a lab where the material is cut into a one-inch strip and pulling the material apart using, for example, an industrial ASTM F-88 seal strength test to determine the integrity of the seal. Alternatively, devices such as those disclosed in U.S. Pat. No. 5,515,159 to Sikes, U.S. Pat. No. 6,097,427 to Dey et al., and U.S. Pat. No. 5,732,529 to Dey et al. are used, wherein the medical packager removes the package from production after it has been sealed and inspects the package with a light and a video camera.
A system for inspecting seal integrity of a sealed package is disclosed herein, including a side lighted visual inspection system and medical packaging device having an integral peel testing system. The visual inspection system comprises a housing, a lens removably attached to the housing, a slit within the housing, and a light source; wherein a seal of a package is placed within the slit, the light source casts light from a side angle onto the seal, and the light enhances topography of said sealed portion of said package visible through the lens. The medical packaging device comprises the integral peel tester integral, a microprocessor coordinating with the peel tester, and a cutting mechanism; wherein, the medical packaging device prompts an operator to test a sample of sealed packages, a sample is removed from said medical packaging device, cut to an appropriate size using said cutting mechanism, and inserted into the peel tester, whereby the peel tester collects seal integrity data and shares the data with the microprocessor, which in turn analyzes the data in correlation to set standards.
The present invention provides systems for thoroughly inspecting seal integrity of sealed packages by peel testing and visual testing. The present invention includes an external visual inspection unit (VIU) for side lighting the seal area of a flexible pouch material, specifically that material used for sterile products, in order to enhance the topography of the seal area to reveal possible breaches in the seal integrity.
As shown in
MP 50 will prompt the MP operator when it is time to perform a seal strength test. These test times are programmed into MP 50 such that, for example, after every five thousand seals MP 50 prompts the user into a test mode. When prompted, the operator removes a package from MP 50 and cuts a sample from the package using cutting bar 56 and clamps the sample into the peel tester 54, preferably using a vice and a thin film grip. The size is any size pre-determined to be suitable for insertion into the peel tester, preferably one inch. The sample is then pulled apart on a motorized stand at a rate of between eight to twelve inches per minute. As the peel tester 54 pulls the material apart, it gathers and records data that is extrapolated. Once the sample is pulled through the entire width of the seal, the operator would stop the MP 50 and gather the data. The data is preferably extrapolated by utilizing an x y histogram that shows that the seal was compliant by holding over one pound of pull over the length of the study. However, an extrapolation process can be used. This information can be sent to a storage device such as a computer for archiving and/or printing. After the operator has pulled apart a sufficient number of samples, for example five pouches, the MP 50 records the seal strength data, and if up to standard, allows the operator to continue on with the sealing function. Having the peel tester 54 integrated with the MP 50 allows the operator to perform the needed peel strength analysis at the MP 50, thereby increasing the efficiency of the seal package production process.
MP 50 also includes an off platen multi-spectrum seal inspection light 60 disposed in the lower jaw assembly which acts as an in-process optical sensing device that inspects seal integrity at the seal platen during the machine's standard production operation. If a breach in a seal is recognized by optical sensor 60, MP 50 will stop and sound an alarm or display an error code, which will effectively reject the seal and prompt further inspection of the machine's operation.
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The device can also have a modem that would allow the user to remotely calibrate the device. Presently, medical packaging devices must be sent to a lab for calibration. Oftentimes, the machines are damaged during the shipping process. By incorporating a modem, an operator would merely have to press a calibration button and the modem would dial into the designated computer. The device would then be prompted to go through a series of calibration performance exercises and the adjustments would be made remotely. After the operator logs off, a certificate of calibration could be sent via, for example, electronic mail.
Moreover, the device can include a sensor or sensors within MP 50 such as at the sealing jaw(s) or the platen surface to provide for either manual or electronic optical inspection. Further, a VIU could be used together with a medical packager to perform both seal integrity tests. The VIU could be an integral part of the MP or the VIU could simply connect to the MP.